[#4] Pass gfx structs by const ref (gfx::PointF)

cc/resources/layer_quad.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 #ifndef CC_RESOURCES_LAYER_QUAD_H_
 #define CC_RESOURCES_LAYER_QUAD_H_
 
 #include "base/basictypes.h"
 #include "cc/base/cc_export.h"
 #include "ui/gfx/point_f.h"
 
 namespace gfx {
 class QuadF;
 }
 
 static const float kAntiAliasingInflateDistance = 0.5f;
 
 namespace cc {
 
 class CC_EXPORT LayerQuad {
  public:
   class Edge {
    public:
     Edge() : x_(0), y_(0), z_(0) {}
-    Edge(gfx::PointF p, gfx::PointF q);
+    Edge(const gfx::PointF& p, const gfx::PointF& q);
 
     float x() const { return x_; }
     float y() const { return y_; }
     float z() const { return z_; }
 
     void set_x(float x) { x_ = x; }
     void set_y(float y) { y_ = y; }
     void set_z(float z) { z_ = z; }
     void set(float x, float y, float z) {
       x_ = x;
@@ skipping 68 matching lines @@
   Edge top_;
   Edge right_;
   Edge bottom_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerQuad);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_LAYER_QUAD_H_